Ubuntu Manpage: PDL::GSL::LINALG - PDL interface to linear algebra routines in GSL

NAME

       PDL::GSL::LINALG - PDL interface to linear algebra routines in GSL

SYNOPSIS

         use PDL::LiteF;
         use PDL::MatrixOps; # for 'x'
         use PDL::GSL::LINALG;
         my $A = pdl [
           [0.18, 0.60, 0.57, 0.96],
           [0.41, 0.24, 0.99, 0.58],
           [0.14, 0.30, 0.97, 0.66],
           [0.51, 0.13, 0.19, 0.85],
         ];
         my $B = sequence(2,4); # column vectors
         LU_decomp(my $lu=$A->copy, my $p=null, my $signum=null);
         # transpose so first dim means is vector, higher dims broadcast
         LU_solve($lu, $p, $B->transpose, my $x=null);
         $x = $x->inplace->transpose; # now can be matrix-multiplied

DESCRIPTION

       This is an interface to the linear algebra package present in the GNU Scientific Library.
       Functions are named as in GSL, but with the initial "gsl_linalg_" removed. They are
       provided in both real and complex double precision.

       Currently only LU decomposition interfaces here. Pull requests welcome!  #line 60
       "LINALG.pm"

FUNCTIONS

   LU_decomp
         Signature: ([io,phys]A(n,m); indx [o,phys]ipiv(p); int [o,phys]signum())

       LU decomposition of the given (real or complex) matrix.

       LU_decomp ignores the bad-value flag of the input ndarrays.  It will set the bad-value
       flag of all output ndarrays if the flag is set for any of the input ndarrays.

   LU_solve
         Signature: ([phys]LU(n,m); indx [phys]ipiv(p); [phys]B(n); [o,phys]x(n))

       Solve "A x = B" using the LU and permutation from "LU_decomp", real or complex.

       LU_solve ignores the bad-value flag of the input ndarrays.  It will set the bad-value flag
       of all output ndarrays if the flag is set for any of the input ndarrays.

   LU_det
         Signature: ([phys]LU(n,m); int [phys]signum(); [o]det())

       Find the determinant from the LU decomp.

       LU_det ignores the bad-value flag of the input ndarrays.  It will set the bad-value flag
       of all output ndarrays if the flag is set for any of the input ndarrays.

   solve_tridiag
         Signature: ([phys]diag(n); [phys]superdiag(n); [phys]subdiag(n); [phys]B(n); [o,phys]x(n))

       Solve "A x = B" where A is a tridiagonal system. Real only, because GSL does not have a
       complex function.

       solve_tridiag ignores the bad-value flag of the input ndarrays.  It will set the bad-value
       flag of all output ndarrays if the flag is set for any of the input ndarrays.

NAME

SYNOPSIS

DESCRIPTION

FUNCTIONS

SEE ALSO